Answer:
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
pH = 9.6
Explanation:
Step 1: Given data
Concentration of OH⁻ in the solution ([OH⁻]): 4.0 × 10⁻⁵ M
Step 2: Calculate the concentration of H₃O⁺ in the solution
Let's consider the self-ionization of water.
2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)
The ion-product of water (Kw) is:
Kw = 1.0 × 10⁻¹⁴ = [H₃O⁺] × [OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/[OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/4.0 × 10⁻⁵
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
Step 3: Calculate the pH of the solution
We will use the following expression.
pH = -log [H₃O⁺]
pH = -log 2.5 × 10⁻¹⁰
pH = 9.6
Taking into account the definition of pH and pOH, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
In this case, you know that [OH⁻]= 4×10⁻⁵ M. For this concentration, the pOH is calculated as:
pOH= - log (4×10⁻⁵ M)
pOH= 4.398
Then, pH can be calculated as:
pH + 4.398= 14
pH= 14 - 4.398
pH= 9.602
So, the [H₃O⁺] is calculated as:
9.602= - log [H₃O⁺]
[H₃O⁺]= 10⁻⁹ ⁶⁰²
[H₃O⁺]= 2.5×10⁻¹⁰ M
Finally, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
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brainly.com/question/13557815?referrer=searchResultsTo measure the amount of iron in a certain type of iron ore, an analytical chemist dissolves a sample in strong acid and titrates it to the endpoint with of potassium permanganate solution. The balanced chemical equation for the reaction is:
Answer:
[tex]\% Fe=11.4\%[/tex]
Explanation:
Hello!
In this case, for the described chemical reaction, we find it is:
[tex]8H^+(aq)+5Fe^{2+}(aq)+MnO_4^-(aq)\rightarrow 5Fe^{3+}(aq)+Mn^{2+}(aq)+4H_2O(l)[/tex]
Because it says that the iron is dissolved in a strong acid which provides addition hydrogen ions to the reaction media. Thus, for the questions attached on the figure we find:
- This a REDOX reaction because we see iron is being oxidized from 2+ to 3+ and manganese reduced from +7 to +2.
- Since it is a redox reaction and the oxidized species is that undergoing an oxidation number increase, we evidence iron goes from +2 to +3, which means iron is the oxidized species.
- In this case, for the used 59.2 mL (0.0592 L) of the 0.2000 M solution of potassium permanganate, we can compute the consumed grams of iron via stoichiometry including the 5:1 mole ratio between them in the chemical reaction:
[tex]m_{Fe^{2+}}=0.0592L*0.2000\frac{molMnO_4^-}{L}*\frac{5molFe^{2+}}{1molMnO_4^-} *\frac{55.85gFe^{2+}}{1molFe^{2+}} \\\\m_{Fe^{2+}}=3.31gFe^{2+}[/tex]
It means that the percent of iron in that sample is:
[tex]\% Fe=\frac{3.31g}{29.00g} *100\%\\\\\% Fe=11.4\%[/tex]
Best regards.
What are the oxidation numbers of the atoms in this reaction?
Check all that apply.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
0 for Mg in Mg and MgCl2
0 for Mg(s) and H in H2
+1 for H in HCl
-1 for Cl in HCl
+2 for Mg in MgCl2
Answer:
2-5
Explanation:
I just did it.
The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂
What is oxidation number?An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.
Oxidation state or number helps us describe the transfer of electrons.
The oxidation number/state is also used to determine the changes that occur in redox reactions.
Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.
Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂
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A student measures the length of two pieces of paper as 8.21 in
and 8.0 in. What is the total length? Be sure to use sig. figs. in
your answer. Do not include the unit.
Answer: 16.21
Explanation:
A student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21 with 4 significant figures.
What are significant figures?
The significant figures or digits are the form of scientific methd which represent the digit from zero to nine and use when the value is uncertain where starting zeros are not significant and decimal is also not a significant figure.
In the given value the total is 16.21 with 4 significant figures with it has 4 significant digits and the decimal with it is not significant after adding from which the respective value is here.
Therefore, with 4 significant figures where the student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21.
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Europium orbital diagram
nitric acid, HNO3, and calcium hydroxide, Ca(OH)2
net ionic equation:
Answer:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
General Formulas and Concepts:
Solubility RulesStrong Acids/BasesExplanation:
Step 1: RxN
HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)
Step 2: Balance RxN
2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)
Step 3: Ionic Equations
Total Ionic Equation:
2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)
Cancel out spectator ions.
Net Ionic Equation:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
Why are metals malleable?
A. Because their lattice energy is very high
B. Because they are made of atoms that have tightly held electrons
C. Because of their structure and uniform bonding in all directions
D. Because they reflect incoming photons
Answer: All I know is it's that opposite of B this may not help but I hope it does.
Explanation:
Answer:
C
Explanation:
ap3x
Help with 3.A and B image provided below
a. P=0.971 atm=737.6 mmHg
b. n=2.88 x 10⁻³
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
[tex]\tt P_T=P_1+P_2+..P_n[/tex]
A. vapor pressure of water at 22.5 = 20.4 mmHg
Pt=P H₂ + P H₂O
758 = P H₂ + 20.4
P H₂=737.6 mmHg=0.971 atm
B.Ideal gas Law = PV=nRT
P = 0.971 atm
V = 72 ml = 0.072 L
R = 0.082 L/atm mol
T = 22.5 + 273.15 =295.65
[tex]\tt n=\dfrac{0.971\times 0.072}{0.082\times 295.65}=2.88\times 10^{-3}[/tex]
limnetic, profundel, littoral, and benefitic have what in common
1.) A laser emits light of frequency 3.72 x 1014 /s. What is the wavelength of the light in m?
2.) Calculate the energy, in joules, of a single photon associated with frequency of 4.00x105/s
3.) Determine the frequency and energy of a photon whose wavelength is 2.57x10-7 m
explanation and work needed please
Answer:
1. λ = 806nm
2. E = 2.6504 × 10^-28J
3. a) f = 1.167 × 10^15 Hz
b) E = 7.73 × 10^-19J
Explanation:
1) The wavelength denoted by λ can be calculated using the formula:
λ = v / f
Where;
v = speed of light (3×10^8m/s)
f = frequency of light (Hz)
λ = 3 × 10^8/3.72 x 1014
λ = 0.80645 × 10^(8-14)
λ = 0.80645 × 10^-6
λ = 8.06 × 10^-7m
λ = 806nm
2) The energy (J) of a photon is calculated thus;
E = hf
Where;
h = Planck's constant (6.626 × 10^-34J/s)
f = frequency (4.00x10^5/s)
E = 6.626 × 10^-34 × 4.00x10^5
E = 26.504 × 10^(-34+5)
E = 26.504 × 10^-29
E = 2.6504 × 10^-28J
3. λ = v / f
2.57x10^-7 = 3 × 10^8 ÷ f
f = 3 × 10^8/2.57x10^-7
f = 1.167 × 10^(8+7)
f = 1.167 × 10^15 Hz
b) E = hf
E = 6.626 × 10^-34 × 1.167 × 10^15
E = 7.7325 × 10^(-34+15)
E = 7.73 × 10^-19J
1. How is 120,700 written in scientific notation?
A. 120.7. 103
B. 12.07. 104
C. 1.207.105
D. 0.1207.106
Answer:
Option B
Explanation:
In order to find the answer to this question you need to move the decimal point as many times as the exponent, positive exponent to the right and negative exponent to the left. In this case we have all positive exponents meaning we move all of them to the right but they all equal the same thing. The most logical answer to this question is option B "10.07×10^4" because the equation is balanced.
Hope this helps.
What is happening at point C in the diagram? HEEEEELPPPP!!!!
Answer:
The answer is B
Explanation:
Because conduction of heat or electricity occurs through a medium(for eg. The heat from a fire going through a metal pot . So in this example the pot is the medium of conduction).
And in this question the medium of heat conduction is the ground, with the heat moving in an upward motion .
What common factor is responsible for three of the
four erosional processes pictured?
A. wind
B. heat
C. human intervention
D. gravity
Answer:
D. gravity
hope this helps
The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group 5A (red). In this representation, each Y atom needs electron(s) to complete its octet, and gains these electrons by forming bond(s) with atoms of H . There are unshared electron pair(s) and bonding electron pair(s) in the product molecule. The bonds in the product are _________ .
Answer:
Each Y atom needs three electrons to complete its octet by forming three bonds to hydrogen. There is one unshared pair of electrons and three bonding pairs of electrons. The bonds in the product are covalent.
Explanation:
Recall that group 5A elements contain five electrons in their outermost shell. These five electrons consists of a lone pair and three electrons that can form three bonds with hydrogen to give YH3 where Y is the group 5A element.
The YH3 molecule contains one lone(unshared) pair of electrons as well as three bonding pairs of electrons. The compounds are covalent.
Help me I’ll do anything
Answer:
its not A B or C soo choose D *This is what i think*
Answer:
A) something that causes physical pain
hope this helps
Explanation:
NEED ANSWERS NOW 100 PTS
Is iron iii fluoride ionic or covalent
Is carbon disulfide ionic or covalent
Answer:
iron i believe is ionic and carbon is covalent
Explanation:
if im wrong correct me
SO3 is a covalent compound with no lone pairs on the central S atom. What's the structure of a molecule of SO3? Is an SO3 molecule polar or non-polar?
Question 14 options:
A)
Trigonal planar, non-polar
B)
Trigonal pyramidal, polar
C)
Trigonal planar, polar
D)
Trigonal pyramidal, non-polar
Answer:
A
Explanation:
it has non polar molecule, because it has the equal sharing of electrons, so equal repulsion from all sides. atoms are equally represented.
Answer:
Trigonal planar, non-polar
Explanation:
Carbon is considered which of the following?
atomic element
molecular element
molecular compound
ionic compound
None of these
Answer:
Atomic element
Explanation:
Carbon is considered an atomic element. Therefore, the correct option is option A among all the given options.
Chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon. There are several ways in which the carbon atoms can connect, giving rise to different allotropes of carbon. Amorphous carbon, diamond, graphite, and fullerenes are examples of well-known allotropes. Carbon is considered an atomic element.
Therefore, the correct option is option A among all the given options.
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How is the difference in the physical properties of the powdered mixture components being used to separate them in this lab
Answer:
This question is incomplete but the missing part is in the picture attached.
Explanation:
A mixture of silicon oxide, ammonium chloride and sodium chloride were to be separated. Three separating techniques were used in the experiment; sublimation, decantation and evaporation.
Sublimation is the process in which a substance changes from solid to gas without passing through the liquid phase. Ammonium chloride (NH₄Cl) is a substance that has the ability to sublime and thus was separated first through this property before adding water to the remaining constituents (silicon oxide and sodium chloride) of the mixture. After the addition of water to the mixture, sodium chloride dissolves in this water while silicon oxide does not dissolve in water. The mixture is then left to stand for some minutes so the undissolved sand can settle at the bottom of the mixture and the dissolved salt water can be decanted out so as to have the silicon oxide left in the jar.
The salt solution decanted will have to be evaporated to dryness (to remove the added water) so as to have the solid salt back.
A binding protein binds to a ligand L with a Kd of 400 nM. What is the concentration of ligand when Y is (a) 0.25, (b) 0.6, (c) 0.95?
Answers: (a) 133.33nm (b) 600nm (c) 7,600nm
Answers above are correct. Please show all steps, really trying to understand.
Answer:
(a) 133.33nm
(b) 600nm
(c) 7,600nm
Explanation:
The concentration of Y can be determined by using the formula:
[tex]Y = \dfrac{[L]}{k_d+[L]}[/tex]
where;
[L] = concentration of the binding ligand.
kd = 400 nm
Thus:
When Y = 0.25; we get :
[tex]0.25 = \dfrac{[L]}{400+[L]}[/tex]
0.25 (400 + [L]) = [L]
100 + 0.25[L] = [L]
100 = [L] - 0.25 [L]
100 = 0.75 [L]
[L] = 100/0.75
[L] = 133.33 nm
At, Y = 0.6
[tex]0.6 = \dfrac{[L]}{400+[L]}[/tex]
0.6 (400 + [L]) = [L]
240 + 0.6[L] = [L]
240 = [L] - 0.6 [L]
240 = 0.4 [L]
[L] = 240/0.4
[L] = 600 nm
At, Y = 0.95
[tex]0.95 = \dfrac{[L]}{400+[L]}[/tex]
0.95 (400 + [L]) = [L]
380 + 0.95[L] = [L]
380 = [L] - 0.95 [L]
380 = 0.05 [L]
[L] = 380/0.05
[L] = 7600 nm
Write the balanced net ionic equation for the reaction of aqueous sodium sulfate with aqueous lead(II) nitrate. Include phases.
net ionic equation:
Answer:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
General Formulas and Concepts:
Solubility RulesExplanation:
Step 1: RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + NaNO₃ (aq)
Step 2: Balance RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + 2NaNO₃ (aq)
Step 3: Ionic Equations
Total Ionic Equation:
2Na⁺ (aq) + SO₄²⁻ (aq) + Pb²⁺ (aq) + 2NO₃⁻ → PbSO₄ (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq)
Cancel out spectator ions.
Net Ionic Equation:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
Most of the elements on the Periodic Table are found in nature as
The process in which proteins are made is called protein
Answer: synthesis
Explanation: hhhhh
Answer:
Synt
Explanation:
how many grams are there in 2.3x10^24 atoms of silver
412.056524g is present in 2.3×10^24atoms of Ag
A student was holding a metal rod to a candle flame. After a while he noticed that his hand was getting hot.
a. Radiation
b. Conduction
c. Convection
d. Transformation
Answer:
Conduction
Explanation:
Conduction is when energy directly travels through a solid to get from one point to another.
A student was holding a metal rod to a candle flame. After a while, he noticed that his hand was getting hot due to conduction.
What is conduction?
The definition of conduction is the movement of something together with warmness or energy through a medium or passage. An instance of conduction is using a metallic rod to roast marshmallows on an open hearth and feeling the warmth rise through the rod from the fire for your hand.
What are 4 examples of conduction?A lizard warming its belly on a hot rock.Touching a hot seatbelt when you get into a car.A blacksmith heating up a sword in hot coals, and the heat transferring up through the metal.The heat from the stovetop transfers into a metal pot of water.
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How many grams of methane gas occupy a volume of 11.2 liters at stp
Answer:
see the pic for the answer
7.91 grams of methane gas occupy a volume of 11.2 liters at STP.
What is STP?
Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.
First, we need to calculate the number of moles:
STP is 0 °C and 1 bar.
One mole of a gas at STP has a volume of 22.71 L .
Moles of CH₄ = 11.2 L × ([tex]\frac{1 mol}{22.71 L}[/tex])
Moles of CH₄ = 0.4932 mol
Now we will calculate the mass of CH₄
Moles = [tex]\frac{mass}{molar \;mass}\\[/tex]
Mass of CH₄ = 0.4932 × 16.03
Mass of CH₄ = 7.91 g
Hence, 7.91 grams of methane gas occupy a volume of 11.2 liters at STP.
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what is a stethoscope
Explanation:
A stethoscope is used to listen to sounds that the heart , lungs , blood flow , intestines make.
Calculate the percent composition by mass of each element in Al(OH)3.Al(OH)3. Use at least three significant figures.
Answer:
Explanation:
Al(OH)₃
Total molecular weight = 27 + 3 x ( 16+1)
= 78
Al = 27
% of Al = 27 x 100 / 78 = 34.61%
O = 48
% of O = 48 x 100 / 78 = 61.55 %
H = 3
% of H = 3 x 100 / 78
= 3.84%
Al = 34.61%.
O = 61.55%.
H = 3.84%.
In which statement does the word theory mean scientific theory?? A) In theory, the experiment will work as planned. B) She has a theory about why the storm arrived later than predicted. C) The atomic theory explains that material objects are made up of atoms. D) The doctor’s prescription for curing a cold is based on his best theory or guess.
Answer: C
Explanation:
I took a quiz on this.
What is laughing gas?
Answer:
Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N ₂O. At room temperature, it is a colourless non-flammable gas, with a slight metallic scent and taste. At elevated temperatures, nitrous oxide is a powerful oxidiser similar to molecular oxygen.
Explanation:
A vertical column of elements in the periodic table is called a
.
A horizontal row of elements in the periodic table is called a
.
Atoms of elements in the same group have the same
.
As you move from left to right on the periodic table, the atomic number
Answer:
A. group
B. period
C. numbers of valence electrons
B. increases
